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单选题
The explosive range of a mixture of flammable vapors is specified as a percentage of （）.
A
flammable vapor by volume in air
B
oxygen present to support combustion
C
the temperature of the flash point
D
the lower limit of explosibility of the mixture
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Which statement is TRUE concerning the flash point of a substance ________．A.It is lower than the ignition temperatureB.It is the temperature at which a substance will spontaneously igniteC.It is the temperature at which a substance，when ignited，will continue to burnD.It is the temperature at which the released vapors will fall within the explosive range
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单选题Reid vapor pressure is（）.A
exerted by liquid cargo on the sides of a tankB
exerted by liquid cargo on a cargo hose bodyC
the lowest temperature and pressure that will cause a flammable liquid to give off vaporsD
a measurement of the amount of flammable vapors given off by a liquid at a certain temperature
考题
单选题A combustible gas indicator meter is calibrated to read the percentage of（）.A
vapor to oxygenB
the flammable limit concentrationC
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the lower explosive limit concentretion
考题
单选题A fuel-air mixture below the lower explosive limit is too（）.A
rich to burnB
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cool to burnD
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单选题How does an inert gas system on a tanker function to prevent explosions in cargo tanks? （）A
De-energizes the charged mist effectB
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考题
单选题A flame screen（）.A
permits the passage of vapor but not of flameB
prevents the passage of flammable vaporsC
prevents inert gas from leaving a tankD
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单选题Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?（）A
The mixture is too lean to burnB
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DANGER - KEEP AWAYB
DANGER - EXPLOSIVE VAPORSC
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单选题A combustible gas indicator is used to determine （）.A
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单选题Which condition is necessary for a substance to burn?（）A
The temperature of the substance must be equal to or above its fire pointB
The air must contain oxygen in sufficient quantityC
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All of the above
考题
单选题Which of the following statements is correct concerning the “flash point ” of a liquid?（）A
It is lower than the ignition temperatureB
It is the temperature at which a substance will spontaneously igniteC
It is the temperature at which a substance, when ignited, will continue to bumD
It is the temperature at which the released vapors will fall within the explosive range
考题
单选题The vapors given off by heated fuel oil are flammable, explosive, and （）A
lighter than airB
heavier than airC
odorlessD
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考题
单选题If the diesel fuel vapors present are within the flammable range （）.A
the vapor air mixture is too rich to burnB
an explosion may occur if a source of ignition is presentC
the vapor air mixture is too lean to bum the upper explosiveD
limit has been exceeded
考题
单选题When flammable liquids are handled in a compartment on a vessel，the ventilation for that area should be（）.A
operated continuously while vapors may be presentB
operated intermittently to remove vaporsC
available on standby for immediate useD
shut down if an explosive mixture is present
考题
单选题An inert gas system on a tanker should be used to（）.A
prevent the generation of flammable or combustible gas in tanksB
blow out cargo lines to prevent the build up of gas concentrationsC
dilute tank atmospheres to keep gas concentrations below the lower explosive limitD
prevent fires in the pumproom by continually displacing flammable vapors
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单选题An inert gas system on a tanker should be used to（）.A
prevent the generation of flammable or combustible gas in tanksB
blow out cargo lines to prevent gas concentrationsC
dilute tank atmospheres to keep gas concentrations below the lower explosive limitD
prevent fires in the pumproom by continually displacing flammable vapors
考题
单选题The minimum concentration of a vapor in air which can form an explosive mixture is called the（）.A
auto-ignition pointB
flash pointC
lower explosive limit (LEL)D
threshold limit value (TLV)
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